G'day Mate,
Your Sorbus looks fine to me, not gunna comment on the styling, or give advice regarding that as I think that that is where one's individual approach comes in.
The rock looks convincing, but there is a root stem that you have cut that should be trimmed clean.
It appears to me that you have not wired the tree into the pot in the conventional way, can't understand that or perhaps you don't know how to do it....?
Would not describe it as a Ne-agari, the root-mass is hugging the ground and for a true exposed-root tree style, the roots are much more prominent and become part of the trunk [as it were].
The soil [regarding colour to rock] is unsympathetic, and looks rather odd, unless you can add another chunk or two [smaller] of the same kinda rock, then you should be able to create a greater harmony.
I like your tree, your pot, it's colour, and size, as to style, just stick to informal upright, or better still root-over-rock.
As to the drooping appearance, that's OK!, too.
Best for the moment,
Nigel
